diff --git a/hw/xfree86/vbe/vbe.c b/hw/xfree86/vbe/vbe.c
index 7a64a4a71..bcda5ec35 100644
--- a/hw/xfree86/vbe/vbe.c
+++ b/hw/xfree86/vbe/vbe.c
@@ -1028,6 +1028,11 @@ VBEInterpretPanelID(int scrnIndex, struct vbePanelID *data)
     if (pScrn->monitor->nHsync || pScrn->monitor->nVrefresh)
 	return;
 
+    if (data->hsize < 320 || data->vsize < 240) {
+	xf86DrvMsg(scrnIndex, X_INFO, "...which I refuse to believe\n");
+	return;
+    }
+
     mode = xf86CVTMode(data->hsize, data->vsize, PANEL_HZ, 1, 0);
 
     pScrn->monitor->nHsync = 1;